JP2014046587A - Laminated film applied with functional porous body, laminate and package - Google Patents

Abstract

The present invention provides a laminated film and a package that have a function for effectively removing odor, moisture, and oxygen that affect the contents of the package and that have a high sealing strength.
SOLUTION: A laminated film in which a sealant film 2 and a functional porous body 3 are laminated, a laminated body including the laminated film, a package formed using the laminated body, and a functional porous body are used. It is related with the package formed in this way.
[Selection] Figure 3

Description

  The present invention relates to a laminated film including a functional porous body, a laminated body including the laminated film, a package formed using the laminate, and a package formed using the functional porous body.

  In recent years, in order to improve the preservability of the contents of packaging containers, especially food, beverages, pharmaceuticals, cosmetics, etc., a multilayer structure film using a functional layer that absorbs excess odor, oxygen, water vapor, etc. in the packaging has been used. A package has been proposed.

  For example, in Patent Document 1, zeolite is contained with respect to an adhesive layer having a multilayer structure including an outer layer of a thermoplastic synthetic resin, a paper base layer, an extrusion laminate layer, an aluminum foil layer, an adhesive layer, and an inner layer of a thermoplastic synthetic resin. Deodorant is applied. However, in this configuration, in order to develop a deodorizing effect on the inner bag portion, it is necessary for the odor component to pass through the inner layer of the thermoplastic synthetic resin and reach the deodorizing agent in the adhesive layer, which is an effective deodorizing effect. Can't get. Moreover, since the adhesive layer contains a powder component that does not contribute to adhesiveness, it has been a factor of weakening the sealing strength between the aluminum foil layer and the inner layer of the thermoplastic synthetic resin.

JP 2007-15736 A

  It is an object of the present invention to provide a laminated film and a packaging body having functionality for effectively removing odors, moisture, and oxygen that affect the contents of the packaging body and having high sealing strength. To do.

As a result of intensive studies in view of the above problems, the present inventors have found that high functionality and high seal strength can be obtained by combining a functional porous body having a specific function and a sealant film, The present invention has been completed. That is, the present invention includes the following inventions.
(1) A laminated film in which a sealant film and a functional porous body are laminated.
(2) The laminated film according to (1), wherein the functional porous body is a porous body carrying a functional substance.
(3) The functional substance is selected from the group consisting of particles and a resin component showing a deodorizing effect, particles and a resin component showing an oxygen absorption effect, and particles and a resin component showing a moisture absorption effect, Laminated film.
(4) The laminated film according to (2) or (3), wherein the functional substance is supported in an amount of 5 wt% to 50 wt% with respect to the total mass of the functional porous body.
(5) The laminated film according to (1), wherein the functional porous body includes a porous body formed from natural fibers.
(6) A laminate having a base material layer on the sealant film side of the laminated film according to any one of (1) to (5).

(7) A package formed using the laminate according to (6), wherein the laminate is superposed so that the functional porous body comes into contact, and heat-sealed to form a bag. Packaging body.
(8) A package formed using a sealant film having a base material layer on one side and the laminate according to (6), the surface of the sealant film having no base material layer and the laminate A package obtained by making a bag by stacking and heat-sealing so that the functional porous body contacts.
(9) A package formed using a sealant film having a base material layer on one side, wherein the surface of the sealant film that does not have a base material layer is overlaid and heat sealed to form a bag. The package, which is obtained, includes a functional porous body heat-sealed in a state sandwiched between sealant films, and a part of the functional porous body is exposed inside the bag of the package .
(10) The package according to (9), wherein the functional porous body is a porous body on which a functional substance is supported or a porous body containing natural fibers.

  The present invention provides a laminated film and a package that can effectively remove odor, moisture, and oxygen that affect the contents of the package, and that have high sealing strength and high laminating properties.

FIG. 1 is a schematic cross-sectional view showing an example of the laminated film of the present invention. FIG. 2 is a schematic cross-sectional view showing an example of the laminate of the present invention. FIG. 3 is a schematic cross-sectional view showing an example of the package of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of the package of the present invention. FIG. 5 is a schematic cross-sectional view showing an example of the package of the present invention.

The present invention will be described below.
As shown in FIG. 1, the laminated film 1 of the present invention has a structure in which a functional porous body 3 is laminated on the surface of a sealant film 2. In the present invention, the functional porous body includes those in which a functional substance is supported on the porous body and those in which the porous body itself has functionality. Increasing the surface area of a functional substance by supporting the functional substance on the porous body and using a porous body having functionality by itself (in other words, a porous body made of a functional substance) The desired function can be effectively expressed.

  As shown in FIG. 2, the laminate 4 of the present invention has a base material layer on the sealant film side surface of the laminate film 1 in which the functional porous body 3 is laminated on the surface of the sealant film 2 via an adhesive layer 6. 5 has a structure arranged. The laminated film 1 and the base material layer 5 may be laminated via the adhesive layer 6, but may be laminated by means other than the adhesive layer.

<Porous body>
A porous body will not be specifically limited if the resin which comprises a sealant film can permeate | transmit in the case of heat sealing, A well-known or commercially available thing can be applied. The porous body is preferably one having air permeability or one having a through hole. The porous body preferably has a through-hole diameter of 0.1 μm to 100 μm or a porosity of 30% to 95% from the viewpoint of resin inflow and functional substance support.

  The structure of the porous body is not particularly limited as long as it is a structure that can be laminated on the surface of the sealant film, and examples thereof include a nonwoven fabric, a woven fabric, a sheet, a film, and a membrane. The layer thickness of the porous body on which the functional substance is supported is preferably 10 to 1000 μm, more preferably 30 to 500 μm, from the viewpoint of the inflow property of the resin and the supportability of the functional substance.

  Examples of the porous material include, for example, synthetic fibers such as polyethylene, polypropylene, polyamide, polyester, polyacrylonitrile, polyvinylidene chloride, polyvinylidene fluoride, polyolefin, polyurethane, polylactic acid, vinylon, rayon, cupra, acetate, etc. Examples include, but are not limited to, chemical fibers, cotton, hemp, pulp, wool, silk, cellulose and other natural fibers, glass fibers and other inorganic fibers, or nonwoven fabrics and woven fabrics made by crossing these fibers. is not.

The structure of the porous body is particularly preferably a nonwoven fabric from the viewpoint of strength. Basis weight of the nonwoven fabric is preferably ^{5~150g / m 2, 10~100g / m} 2 is more preferable. When the basis weight is 10 g / m ² or more, sufficient rigidity and strength are ensured, and when it is 100 g / m ² or less, workability is ensured and the inflow property of the resin can be maintained.

  From the viewpoint of heat sealability, a porous body containing a thermoplastic synthetic resin, particularly a nonwoven fabric containing a thermoplastic synthetic fiber is preferable. Examples of thermoplastic synthetic fibers include polyethylene fibers such as polyethylene terephthalate, polybutylene terephthalate, and copolyester, nylon fibers such as nylon 6, nylon 66, and copolyamide, low density polyethylene, high density polyethylene, polypropylene, copolymer polyethylene, Aromatic polyester copolymer obtained by copolymerizing polyolefin fiber such as copolymerized polypropylene, polyethylene terephthalate with one or more compounds of phthalic acid, isophthalic acid, sebacic acid, adipic acid, diethylene glycol and 1,4-butanediol. Examples include fibers. These fibers may be used alone or in combination of two or more. In particular, polyethylene fibers are preferable from the viewpoint of heat sealability.

  On the other hand, porous materials containing hydrophilic natural fibers such as cotton and pulp, and preferably non-woven fabrics and woven fabrics have a hygroscopic effect. Even if it is not carried, it can be laminated on the sealant film as a functional porous body. Nonwoven fabrics and woven fabrics obtained by multiplying natural fibers and other fibers also have a hygroscopic effect due to natural fibers, and therefore can be laminated on a sealant film as a functional porous body without supporting a functional substance. In addition to the hygroscopic effect of natural fibers, a functional substance may be further supported in order to add an oxygen absorbing effect and a deodorizing effect. Nonwoven fabrics and woven fabrics made only of natural fibers are particularly preferable from the viewpoint of safety with respect to the contents. Among natural fibers, it is preferable from the viewpoint of safety to apply cotton (cotton) widely developed for medical use.

  The method for obtaining the nonwoven fabric from the fibers as described above is not particularly limited. For example, a method using a card machine such as a roller card or a flat card, a dry method in which short fibers are arranged in a certain direction or randomly by an air flow called air array, and a short fiber is dispersed in a medium and dispersed on a net. The nonwoven fabric can be formed by a wet method in which a fleece is formed and dried. The obtained web can be formed into a nonwoven fabric by applying an entanglement method corresponding to a material to be used appropriately such as a chemical bond method, a thermal bond method, a needle punch method, a hydroentanglement method, or the like. Further, a known method such as a spunbond method, a melt blow method, or a solvent-based flash spinning method may be selected as appropriate.

  The porous body may be laminated on the entire surface of the sealant film, or may be laminated only on a part as long as the function of the functional substance is expressed. Since the porous body is usually not transparent, it is difficult to visually recognize the inside of the package formed using a laminated film in which the porous body is laminated on the entire surface of the sealant film. In a package formed using a laminated film laminated only on a part of the surface of the sealant film, the inside can be visually confirmed. In addition, by using a laminated film in which a porous body is laminated only on a part of the sealant film, the amount of expensive functional material used can be reduced, which is also effective from the viewpoint of cost reduction.

<Functional substances>
Examples of the functional substance include substances having a deodorizing effect, an oxygen absorbing effect, and / or a hygroscopic effect, and known or commercially available materials can be applied, for example, porous powder and chemical adsorption to the porous powder. Substances (adsorbents) having an adsorbing effect on target substances (odor substances, moisture, oxygen, etc.) such as those in which an agent is immobilized can be used. Here, the adsorption includes physical adsorption and chemical adsorption.

  The substance having a deodorizing effect (deodorant material) preferably has an adsorption function for odorous substances, and porous powder or powder obtained by immobilizing a chemical adsorbent on porous powder is preferably used. It is done. Examples thereof include zeolite, siliceous, activated carbon, titania, calcium phosphate, phosphate compound, alumina, and mixtures thereof, but are not limited thereto. In particular, it is preferable to apply a zeolite system from the viewpoint of having a porous state effective for the size of the object to be adsorbed and safety. Chemical adsorbents include acidic compounds for ammonia and amines to be removed, basic compounds for carboxylic acids, hydrogen sulfide, and mercaptans, and amines for aldehyde compounds. Compounds.

  The substance having a hygroscopic effect (hygroscopic material) preferably has an adsorption function for water or water vapor. Examples of the material having a hygroscopic effect include, but are not limited to, silica gel, alumina gel, silica alumina gel, natural zeolite, synthetic zeolite, hygroscopic resin, or a mixture thereof. The material having a moisture absorption effect also includes a material having a moisture conditioning effect. The humidity control effect refers to the effect of absorbing moisture when the humidity is high and releasing moisture when the humidity is low to keep the humidity constant.

  The substance having an oxygen absorption effect (oxygen absorber) is preferably one having an adsorption function for oxygen and having a reversible oxygen absorption site generated by forced extraction of oxygen, for example, cerium oxide. , Inorganic oxides such as titanium oxide and zinc oxide, inorganic mixtures of reduced iron and metal halides, ascorbic acid, MXD6 nylon, ethylenically unsaturated hydrocarbons, polymers having cyclohexene groups and organic systems of transition metal catalysts Examples thereof include, but are not limited to, a mixture or a mixture thereof. These functional substances may be used alone or in combination of two or more. In addition, one type of functional substance may have a plurality of types of functions.

  In the present invention, by supporting these functional substances on the porous body, the surface area of the functional substance capable of efficiently expressing the functionality is increased, and the deodorizing effect, oxygen absorbing effect and moisture absorption are increased. The effect can be expressed more efficiently. In particular, a substance having a deodorizing effect and a substance having a hygroscopic effect are often porous bodies, and both can exhibit higher functionality by increasing the surface area. In addition, the functionality of a functional substance that is not a porous body is further improved by increasing the surface area.

  When these functional substances are granular, the particle diameter is preferably 50 nm to 20 μm, more preferably 100 nm to 10 μm in terms of average particle diameter. Here, the average particle size can be measured by, for example, a particle size distribution measuring device LA-920: manufactured by Horiba, Ltd. By making the particle diameter within the above range, it becomes easy to carry the functional substance inside the porous body.

<Method for forming functional porous body>
The method for supporting the functional substance on the porous body is not particularly limited, and a known method or a coating method or an impregnation method using a commercially available apparatus can be applied. For example, application using a roll coat, gravure roll coat, kiss coat, spray coat, inkjet printer, doctor blade and other tools, wire bars, squeegees, applicators, die coat, etc. may be applied.

  As an example, a porous material (functionality) in which a functional material and a binder component dissolved or dispersed in a dispersion medium are mixed and dispersed, applied to or impregnated into a porous material, and dried to carry the functional material. Porous body) can be formed. What is necessary is just to set the drying conditions after application | coating or impregnation suitably by conditions, such as the volatilization temperature of the dispersion medium to be used, and the glass transition temperature of a binder component. In order to impart affinity on the fiber surface of the nonwoven fabric, the functional material may be applied after treatment with a binder component. In particular, a method of mixing and dispersing a functional substance and a binder component dispersed in a dispersion medium and impregnating the porous body is preferably used. By applying the above method as a method for forming a functional porous body, it is possible to effectively carry a functional substance inside the porous body.

  The binder is not particularly limited as long as it is a resin that can be applied in the form of being dispersed or dissolved in a dispersion medium, or a resin that can be applied in the form of a fine powder emulsion, and known or commercially available binders can be used. Examples thereof include polyvinyl alcohol, polyvinyl butyral, polyester, polyvinyl chloride, polycarbonate, cellulose acetate, polyethylene, polypropylene, polystyrene, polyacrylonitrile, or a mixture of these resins. In particular, it is preferable to apply polyester in consideration of safety of the package contents.

  A known or commercially available dispersion medium can be used, and is appropriately selected depending on the type of binder component or porous material to be dispersed or dissolved, and is not particularly limited. For example, aliphatic carbonization such as water, hexane, heptane, and cyclohexane Examples thereof include aromatic hydrocarbons such as hydrogen, toluene and xylene, alcohols such as methanol, ethanol and isopropyl alcohol, ketones such as acetone, methyl ethyl ketone and cyclohexanone, and esters such as ethyl acetate and butyl acetate. From the viewpoint of solubility and dispersibility of the binder component, it is preferable to apply a mixed solvent of ethyl acetate and methyl ethyl ketone, or each solvent alone.

  The amount of the functional substance supported on the porous body is not particularly limited as long as a desired function can be expressed, but is about 1 wt% to 70 wt%, preferably about 5 wt% to 50 wt% with respect to the total mass of the functional porous body. Yes (when dry). By setting the loading amount to 1 wt% or more, the function of the functional substance can be sufficiently expressed, and by setting it to 70 wt% or less, it is possible to maintain adhesiveness and adhesion during heat sealing.

<Sealant film>
A sealant film will not be specifically limited if it is a film which has heat-sealing property, A well-known or commercially available thermoplastic resin can be applied. Heat sealing refers to applying heat to soften / melt one or both fibers and films to bond the materials together. The heat sealability refers to a property that can be melted by heat and fused to each other.

  For example, polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic Use an acid copolymer, an ethylene-methacrylic acid copolymer, an ethylene-methyl methacrylic acid copolymer, an ethylene-propylene copolymer, a methylpentene polymer, an acid-modified polyolefin resin, and a mixture of these resins. However, it is not limited to these resins. In particular, it is preferable to apply linear low density polyethylene as a resin having excellent heat seal strength.

  If the thickness of the sealant film is 5 μm or more, heat sealability can be exhibited. However, from the viewpoint of imparting high heat sealability, it is preferably about 10 μm to 500 μm.

<Laminated film>
The laminated film of the present invention can be produced by laminating a functional porous body on the sealant film surface. The method for laminating the functional porous body with the sealant film is not particularly limited, and examples thereof include heat sealing, roll laminating, and heat pressing. What is necessary is just to set suitably the temperature conditions at the time of this lamination | stacking by conditions, such as the glass transition temperature of the sealant layer to apply. Moreover, what laminated | stacked only the functional porous body and the sealant film is applicable as a laminated | multilayer film.

<Laminate>
The laminated body of this invention has a base material layer on the sealant film side surface of the laminated film by which a functional porous body is laminated | stacked on the surface of a sealant film. The laminated film and the base material layer may be laminated via an adhesive layer, but may be laminated by means other than the adhesive layer.

  As an adhesive for adhering the sealant film side of the laminated film and the base material layer, known or commercially available adhesives can be used and are not particularly limited. For example, polyvinyl acetate adhesive such as polyvinyl acetate and vinyl acetate-ethylene copolymer, polyacrylic adhesive such as copolymer of polyacrylic acid and polystyrene, polyester, polyvinyl acetate, cyanoacrylate Adhesives, ethylene copolymer adhesives consisting of copolymers of ethylene and monomers such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, etc., cellulose adhesives, polyurethane adhesives, polyester adhesives , Polyamide adhesives, polyimide adhesives, polyolefin adhesives, amino resin adhesives made of urea resin or melamine resin, phenol resin adhesives, epoxy adhesives, reactive (meth) acrylic adhesives Made of chloroprene rubber, nitrile rubber, styrene-butadiene rubber, etc. Mer-based adhesive, silicone adhesive, an alkali metal silicate, inorganic adhesive made of a low-melting-point glass or the like, may be used other adhesives.

The adhesive composition may be in any form such as an aqueous type, a solution type, an emulsion type, and a dispersion type, and the property may be any form such as a film / sheet shape, a powder shape, a solid shape, and the like. The bonding mechanism may be any form such as a chemical reaction type, a solvent volatilization type, a heat melting type, and a hot pressure type. The adhesive can be applied, for example, by roll coating, gravure roll coating, kiss coating, or other coating methods, and the coating amount is preferably about 0.1 to 10 g / m ² (dry state). By setting the coating amount of the adhesive within the above range, good adhesiveness can be obtained.

<Base material layer>
A base material layer is not specifically limited, A well-known or commercially available plastic film can be applied, and is suitably selected by the difference in gas barrier property calculated | required with respect to the package contents. Specific examples of the plastic film include polyolefin such as polyethylene and polypropylene, cyclic polyolefin, polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, poly (meth) acrylate, polycarbonate, polyethylene terephthalate, poly Films made of various plastic materials such as polyester such as butylene terephthalate and polyethylene naphthalate, polyamide, polyimide, polyurethane, acetal, and cellulose can be used. Among the plastic films, it is particularly preferable to use a film made of polyester, polyamide, or polyolefin because it has mechanical strength and is excellent in pinhole resistance.

  In the present invention, the base material layer uses one or more resins, and is formed into a single film by using a film forming method such as an extrusion method, a cast molding method, a T-die method, a cutting method, and an inflation method. By a method, or a method of forming a multi-layer coextrusion film using two or more kinds of resins, and a method of using two or more kinds of resins and mixing them before forming a film to form a film Can be manufactured. Furthermore, it can be set as the film extended | stretched to the uniaxial or biaxial direction using a tenter system, a tubular llama system, etc.

  Specifically, for example, stretched / non-stretched nylon, high density polyethylene, uniaxially stretched / biaxially stretched high density polyethylene, polypropylene, uniaxially stretched / biaxially stretched polypropylene, low density polypropylene, linear low density polyethylene, polyethylene terephthalate Examples thereof include a film in which a deposited film of silica or alumina is formed on a polybutylene terephthalate film, a film in which an aluminum foil or the like is applied as a single layer or a multilayer body, and the like. In particular, it is preferable to apply a polyester film on which a deposited film of silica or alumina is formed. By applying the film, high water vapor barrier properties and oxygen barrier properties can be imparted.

<Packaging body>
Although the form in particular of the package of this invention is not restrict | limited, A packaging bag and a packaging container are contained, Preferably it is a packaging bag. In the packaging body of the present invention, the laminate is laminated so that the functional porous body is in contact with the functional porous body, or the functional porous body and the sealant film are in contact with each other. Thus, it is obtained by overlapping or heat-sealing a conventional laminate so that the sealant films are in contact with each other with the functional porous body in between. By sealing the sealant film through the functional porous material, the resin that composes the sealant film penetrates the functional porous material and fuses it while filling the voids in the porous material. Can be obtained. On the other hand, in the part that is not heat-sealed, the functional porous body has a large surface area and exists in the innermost layer of the package. The function of the substance or the porous body itself, that is, the deodorizing effect, the oxygen absorbing effect and the moisture absorbing effect can be expressed to the maximum.

  In order to manufacture the package, as shown in FIG. 3, the laminate 4 of the present invention is folded in two or two sheets are prepared, and the surfaces of the functional porous body 3 are opposed to each other. The peripheral end portion 7 is, for example, a standing pouch type, a side seal type, a two-side seal type, a three-side seal type, a four-side seal type, an envelope-attached seal type, a palm-attached seal type (pillow seal type), and a pleated seal type Various types of packaging bodies can be formed by heat-sealing with a heat-seal form such as a flat-bottom seal type, a square-bottom seal type, or a gusset type. As a heat sealing method, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, or an ultrasonic seal can be used.

  As shown in FIG. 4, the laminate 4 of the present invention (a laminate comprising the functional porous 3, the sealant film 2, and the base material layer 5) and the conventional laminate (the sealant film 2 having no functional porous). And a layered body including the base material layer 5), the surface of the functional porous body 3 and the surface of the sealant film 2 are opposed to each other, and the peripheral edge portion 7 is heat-sealed, so that various forms are obtained. It is also possible to form a package.

  Alternatively, as shown in FIG. 5, the conventional laminate (a laminate comprising the sealant film 2 having no functional porous and the base material layer 5) is folded in half or two sheets are prepared, and the sealant film is prepared. 2 facing each other, superposing the functional porous body on the peripheral edge 7 to be heat-sealed, heat-sealing so that a part of the functional porous body is exposed inside the bag of the packaging body, Various forms of packages can also be formed. The functional porous body that is heat-sealed between the sealant film is strongly fixed by the resin that forms the sealant film flowing into the interior to fill the gap, and the heat-sealability of the package is also inhibited. Not. Furthermore, since the functional porous body is exposed inside the bag of the packaging body, the function of the functional substance or the porous body itself, that is, the deodorizing effect, the oxygen absorbing effect and the moisture absorbing effect can be highly expressed. it can.

  The packaging bag or packaging container comprising the laminate of the present invention is particularly suitable for packaging chemical products, pharmaceuticals, quasi-drugs, cosmetics, foods and the like containing an organic compound as an active ingredient, for example, an outer bag of a patch. Or as a standing pouch used for refill contents such as liquid detergents, liquid softeners and liquid soaps. In particular, the laminate of the present invention not only has excellent functions such as a deodorizing effect, an oxygen absorbing effect, and a moisture absorbing effect, but also exhibits an excellent seal strength, and therefore a standing pouch that needs to be filled with a large volume of liquid. Thus, it is suitable for manufacturing packaging bags that require high impact resistance. In order to manufacture the package by filling the contents, after filling the contents from the filling port left without sealing, the filling port is heat-sealed by, for example, a degassing seal or the like and sealed.

  The laminate of the present invention can also be used as a building material having excellent functions such as a deodorizing effect, an oxygen absorbing effect, and a moisture absorbing effect. When the laminate of the present invention is applied to building materials, a highly functional wall material is formed by integrating the sealant film side with the wall material and heat seal of the sealant film integrated with the functional porous body. Is possible.

  The package of the present invention is characterized by having a structure in which sealant films are heat-sealed via a functional porous body. Conventionally, it is not considered preferable to heat-seal by overlapping porous bodies from the viewpoint of heat-sealing strength, and porous bodies containing natural fibers were also considered unsuitable for heat-sealing. . Moreover, even if it was the porous body which consists of resin which has heat-sealing property, when functional substances, such as a deodorizing material, were carry | supported, it was known that heat-sealing property would fall. Therefore, a functional substance is not supported on a porous body for heat sealing. In the present invention, by combining the functional porous body and the sealant film, the functional substance is disposed on the outermost surface with respect to the target substance inside the package, and the surface area is increased to maximize its function, and high Succeeded in achieving heat seal strength.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to the range of an Example.

<Example 1>
Deodorant as a functional substance (Toagosei Co., Ltd .: NS-241, chemisorption type deodorant made by combining amine compound and porous inorganic compound), binder component (Unitika Elitel: UE3201-30ME ( Polyester resin), dispersion medium is a mixed solvent of MEK / ethyl acetate = 1/1, resin solid content: 30 wt%, Tg: 65 ° C.) 3.33 g, dispersion medium (MEK / ethyl acetate = 1/1 mixed solvent) 22 .67 g was mixed to prepare a functional substance forming paste. After impregnating the above-mentioned functional substance-forming paste into a porous body (Unicel Corporation: polyethylene fiber-based nonwoven fabric, basis weight 15 g / m ² , film thickness 70 μm), it is dried by drying in an oven at 80 ° C. for 5 minutes. A functional porous body carrying a functional substance was prepared. The amount of the functional substance with respect to the total mass of the functional porous body at the time of drying was about 8 wt%. This functional porous body and a film (Toyobo Co., Ltd .: Rix, linear low-density polyethylene film) are laminated, and are integrated at 115 ° C. using a roll laminator (Takachiho Seiki Co., Ltd .: LPP450), and a laminated film Was made.

<Example 2>
Deodorant material (Toagosei Co., Ltd .: NS-241) as a functional substance, binder solution (Sekisui Chemical Co., Ltd .: Polyvinyl butyral BL-5 (Tg: 85 ° C.) dissolved in ethyl acetate and polyvinyl butyral solid component 10 wt. % Solution) 10 g and dispersion medium (ethyl acetate) 16 g were mixed to prepare a functional substance paste. After impregnating the above-mentioned functional substance paste into a porous material (Unicel Corporation: polyethylene fiber-based nonwoven fabric, basis weight 15 g / m ² , film thickness 70 μm), it is dried in a drying furnace at 80 ° C. for 5 minutes to obtain functional properties. A functional porous body carrying a substance was prepared. The amount of the functional substance with respect to the total mass of the functional porous body at the time of drying was about 8 wt%. This functional porous body and a film (Toyobo Co., Ltd .: Rix, linear low-density polyethylene film) are laminated, and are integrated at 115 ° C. using a roll laminator (Takachiho Seiki Co., Ltd .: LPP450), and a laminated film Was made.

<Example 3>
Deodorant as a functional substance (Toagosei Co., Ltd .: NS-241), binder component (Unitika Elite: UE3201-30ME (polyester resin), dispersion medium: MEK / ethyl acetate = 1/1 mixed solvent, resin A functional substance paste was prepared by mixing 3.33 g of solid content: 30 wt%, Tg: 65 ° C., and 22.67 g of a dispersion medium (MEK / ethyl acetate = 1/1 mixed solvent). A porous material (Asahi Kasei Fibers Co., Ltd .: cotton-based natural fiber, film thickness 100 μm) was impregnated with the functional material paste, and then dried in an oven at 80 ° C. for 5 minutes to carry the functional material. A functional porous body was prepared. The amount of the functional substance with respect to the total mass of the functional porous body at the time of drying was about 10 wt%. This functional porous body and a film (Toyobo Co., Ltd .: Rix, linear low-density polyethylene film) are laminated, and are integrated at 115 ° C. using a roll laminator (Takachiho Seiki Co., Ltd .: LPP450), and a laminated film Was made.

<Comparative Example 1>
A film was prepared by extruding a linear low density polyethylene (prime polymer: Evolue SP2020) and a deodorizing material (Toagosei Co., Ltd .: NS-241) as a functional substance using an inflation method. The film thickness was about 50 μm, and the amount of functional substance added was adjusted to 10 wt% of the entire film.

<Comparative example 2>
Deodorant as a functional substance (Toagosei Co., Ltd .: NS-241), binder component (Unitika Elite: UE3201-30ME (polyester resin), dispersion medium: MEK / ethyl acetate = 1/1 mixed solvent, resin Solid content: 30 wt%) 3.33 g and dispersion medium (MEK / ethyl acetate = 1/1 mixed solvent) 22.67 g were mixed to prepare a functional substance paste. Using a gravure coating tester (Kurabo Co., Ltd .: GP-10), coat the functional material paste uniformly on the film (Toyobo Co., Ltd .: Rix, linear low-density polyethylene film), and in a drying oven at 80 ° C A functional material layer forming film was prepared by drying for about 5 minutes. The thickness of the functional material layer is about 5 μm. The amount of the functional substance when dried in the functional substance layer was 12 wt%.

<Comparative Example 3>
Deodorant material (Toagosei Co., Ltd .: NS-241) as a functional substance, binder solution (Sekisui Chemical Co., Ltd .: Polyvinyl butyral BL-5 (Tg: 85 ° C.) dissolved in ethyl acetate and polyvinyl butyral solid component 10 wt. % Solution) 10 g and dispersion medium (ethyl acetate) 16 g were mixed to prepare a functional substance paste. Using a gravure coating tester (Kurabo: GP-10), uniformly coat the functional material paste on the film (Toyobo: Ricks, linear low-density polyethylene film) and dry at 80 ° C. The functional material layer forming film was produced by drying for 5 minutes. The thickness of the functional material layer is about 5 μm. The amount of the functional substance when dried in the functional substance layer was 12 wt%.

<Deodorization effect evaluation>
A film made of Teflon with a capacity of 500 mL (DuPont: Tedlar bag) was filled with one piece of film prepared in Examples and Comparative Examples cut into 3 cm × 3 cm, and acetaldehyde was injected to a concentration of 30 ppm, and it was allowed to stand at room temperature for 1 hour. After standing, the acetaldehyde concentration was detected with a detector tube (Gastech Inc .: acetaldehyde detector tube).

<Heat sealability evaluation>
Fold the film produced in Examples and Comparative Examples cut into 10 cm × 10 cm in half so that the innermost side is in contact with the package, and use a heat seal tester (tester industry: TP-701-A). , 160 ° C., 1 kgf / cm ² , 1 s were prepared by heat-sealing a 1 cm × 10 cm region (the end was not heat-sealed and bonded, and was divided into two forks). Tensile strength when this sample was cut into a strip with a width of 1.5 cm and each end divided into two forks was attached to a tensile tester and tested under conditions of a test speed of 300 mm / min and a load range of 50 N. (N / 15 mm) was measured.

<Evaluation results>
The evaluation results of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1 below.

  From the above results, a laminated film obtained by laminating a functional porous body with good heat sealability as in Examples 1 and 2 and a functional porous body without heat sealability as in Example 3 on a sealant film. By using it, it was confirmed that a package with good functionality (deodorizing effect) and heat sealability for the package contents can be produced.

1: Laminated film 2: Sealant film 3: Functional porous body 4: Laminated body 5: Base material layer 6: Adhesive layer 7: Heat seal part

Claims (10)

  A laminated film in which a sealant film and a functional porous material are laminated.   The laminated film according to claim 1, wherein the functional porous body is a porous body carrying a functional substance.   The laminated film according to claim 2, wherein the functional substance is selected from the group consisting of particles and a resin component showing a deodorizing effect, particles and a resin component showing an oxygen absorption effect, and particles and a resin component showing a moisture absorption effect.   The laminated film according to claim 2 or 3, wherein the functional substance is supported in an amount of 5 wt% to 50 wt% with respect to the total mass of the functional porous body.   The laminated film according to claim 1, wherein the functional porous body includes a porous body formed from natural fibers.   The laminated body which has a base material layer in the sealant film side of the laminated | multilayer film of any one of Claims 1-5.   It is a package formed using the laminated body of Claim 6, Comprising: This laminated body is piled up so that a functional porous body may contact, and a package body obtained by making a bag by heat-sealing .   A package formed using a sealant film having a base material layer on one side and the laminate according to claim 6, wherein the surface of the sealant film not having a base material layer and the functionality of the laminate A package obtained by making a bag by overlapping and heat-sealing so that the porous body comes into contact.   A package formed using a sealant film having a base material layer on one side, and obtained by making a bag by superposing and heat-sealing the surface of the sealant film on the side having no base material layer The packaging body comprising a functional porous body heat-sealed in a state sandwiched between sealant films, wherein a part of the functional porous body is exposed inside the bag of the packaging body.   The package according to claim 9, wherein the functional porous body is a porous body on which a functional substance is supported or a porous body containing natural fibers.

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